C Series

The C series of paper is used only for envelopes; as the area of a C series sheet is the geometric mean of the A and B series sheets of the same number. This means that an A4 sheet is slightly smaller than a C4 sheet, which in turn is slightly smaller than a B4 sheet. In practice this means that an A4 letter could fit unfolded into a C4 envelope which could then fit into a B4 envelope.

ISO C Series Paper Sizes Table

Download C Series Paper Sizes PDF Factsheet

A Series Paper Sizes
A4 Paper Size
US Letter Paper Size
Billboard Sizes
Newspaper Sizes
ISO Envelope Sizes
US Envelope Sizes
ANSI Paper Sizes
Business Card Sizes
Photo Sizes
Old Imperial Sizes
Canadian Paper Sizes
North American Architectural Sizes

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